Greencastle, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greencastle, a borough in Franklin County, Pennsylvania.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. East wind around 3 mph.
7-day forecast for Greencastle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 3 mph E | 0% |
| Tonight | 67°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph E | 16% |
| Wednesday | 85°F | Showers And Thunderstorms Likely | 2 to 6 mph E | 67% |
| Wednesday Night | 70°F | Chance Showers And Thunderstorms | 5 mph SE | 47% |
| Thursday | 90°F | Partly Sunny then Showers And Thunderstorms Likely | 6 mph S | 61% |
| Thursday Night | 70°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 1 to 5 mph SW | 61% |
| Friday | 89°F | Partly Sunny then Showers And Thunderstorms Likely | 1 to 6 mph SW | 55% |
| Friday Night | 69°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 5 mph SW | 55% |
| Saturday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 6 mph W | 43% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 43% |
| Sunday | 89°F | Mostly Sunny | 1 to 6 mph W | 14% |
| Sunday Night | 70°F | Partly Cloudy | 1 to 6 mph SW | 14% |
| Monday | 91°F | Mostly Sunny | 1 to 9 mph W | 14% |
| Monday Night | 69°F | Partly Cloudy | 2 to 8 mph SW | 14% |
Forecast source: National Weather Service (api.weather.gov) for Greencastle (39.791, -77.727). Updated through the day.
Growing snapshot for Greencastle
Last spring frost
Apr 7
First fall frost
Nov 4
Growing season
209 days
Hardiness zone
7a
More local growing data for Greencastle: nearby ZIP 17225 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Blue Ridge Summit
Chambersburg
Fayetteville
Fort Loudon
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Marion
Mercersburg
Mont Alto
Orrstown
Pen Mar
Rouzerville
Scotland
State Line
Wayne Heights
Waynesboro
Climate data from the nearest NOAA station, Hagerstown Washington Co Ap, Md (5.5 mi from Greencastle). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.